M16-2 X 300mm 內六角螺絲 | 內六角驅動 | 部分螺紋 | Class 12.9 合金鋼 熱處理黑氧化 (10顆/包)

Used a set for a jig build on a custom machine table and the threading cut cleanly, no binding issues at all. The black oxide finish held up great against minor oil exposure during assembly.

I was a bit skeptical about the black oxide finish holding up under heavy jig use, but these M16-2 screws have shown no wear after repeated assembly cycles. The 300mm length fits perfectly in my precision setup.

These threads seated cleanly into my jig fixture without any binding, which is exactly what I needed for this precision assembly. The hex socket drive grips well with a standard Allen key, and the partially threaded length gives good clamping range. Class 12.9 feels reassuringly solid for heavy mach